Light control sheets, light control devices and methods of producing light control sheets
AssigneeToppan Holdings Inc.
InventorKaori MORINAGA
Life of this patent
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Abstract
A light control sheet includes a light control layer containing a liquid crystal composition, a pair of alignment layers sandwiching the light control layer, and a pair of transparent electrode layers sandwiching the light control layer and the pair of alignment layers. The alignment layers have a thermal weight loss rate of 4% or less when the alignment layer are heated at 130° C. for 30 minutes. The alignment layers contain a polymer compound having a skeleton composed of polyimide or a polyimide precursor. The alignment layers include a structure produced by reacting a polyamic acid with a compound having at least one functional group selected from the group consisting of an epoxy group, a carbodiimide group and oxazoline group.
Claims15
A light control sheet comprising:
- a light control layer containing a liquid crystal composition;
- a pair of alignment layers sandwiching the light control layer;
- and
- a pair of transparent electrode layers sandwiching the light control layer and the pair of alignment layers, wherein
- the alignment layers have a thermal weight loss rate of 4% or less when the alignment layers are heated at 130° C. for 30 minutes.
A method of producing a light control sheet, the method comprising:
- forming a first alignment layer on a first transparent electrode layer supported by a first transparent support layer;
- forming a second alignment layer on a second transparent electrode layer supported by a second transparent support layer;
- and
- forming a light control layer containing a liquid crystal composition between the first alignment layer and the second alignment layer, wherein
- the first alignment layer and the second alignment layer are formed so as to have a thermal weight loss rate of 4% or less when the alignment layers are heated at 130° C. for 30 minutes.
Dependencies are inferred from the claim text.